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Catur Kurniadi 9/16/2009
Charlie Heaps 9/17/2009
2393 Views Hi Catur,
LEAP is primarily an annual time step model. However, for electricity calculation you can optionally specify a load shape that reflects seasonal and time-of-day variations in both demands and in the dispatch priority and availability of electric supply options.
By default (e.g. in the Freedonia data set) the shape of the demand is specified using a simple load duration curve which does not explicitly include seasonal or time of day information. So you may want to consider using one of the other two methods that allow loads to be explicitly subdivided into different time slices.
You choose these methods on the General: Basic Parameters: Load screen. After that you can edit load shapes in the General: Load Shapes screen. Below is the relevant text from the help file.
I hope this helps,
Charlie
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LEAP provides three alternative methods for describing electric system load:
* Load Duration Curve For Entire System: With this method you exogenously specify one Load Duration Curve (LDC) for the entire electric system. An LDC is a curve that describes in percentage terms how the peak power requirements vary from the highest load down to the lowest load. The Y axis of the curve shows loads as a percentage of the peak load, while the X axis of the curve lists the hours in the year sorted from the hour with highest load (0 hours) down to the lowest (8760 hours). Because it is sorted the curve always decreases from left to right. It is important to note that the curve does not contain information about the season, month or time of day of any given point in the curve. This approach has the benefit of having fairly low data requirements but does not enable you to simulate different levels of availability or different dispatch strategies for different periods of the year. When using this method you specify the actual data describing the LDC as a series of expressions for each Transformation module. You can specify an initial LDC shape for the Base Year and then exogenously specify how this might change in each scenario. Note however, that the LDC shape must be changed endogenously. It will not change automatically as the structure of electric sector demands alter over time in scenarios. If you wish to have demand changes automatically reflected in the load curve shape, consider using the more data intensive method 2 described below.
* Seasonal/Time of Day Load Shape for Each Electric Demand Technology: With this method, you specify load shapes separately for each demand technology. This is done by selecting a load shape for each demand technology on the Energy Intensity data entry screens in the Current Accounts scenario. Unlike in method 1 above, in this method you can specify seasonal and time of day information about load shapes by dividing up each load shape into any number of different time slices, For more information, refer to the Time Slices and Load Shapes topics. When using this method, the overall system load shape is calculated internally by summing across the various load shapes specified for individual demand technologies. This has the advantage that structural shifts in demand over time in different scenarios will automatically be reflected in changes in the load shape. In addition, with this method selected you can also more accurately simulate electric generation dispatch since you can specify both how power plant availability varies by season and how dispatch strategies vary by season. Although it can potentially be a more accurate method, bear in mind that this approach requires considerably more data than method 1 above. It can also be hard to calibrate this approach to match real-world aggregate load curve data.
* Seasonal/Time of Day Load Shape for Entire System: This third method is a hybrid of the above two approaches. Using this method allows you to specify load shapes for an entire electric system and is thus much less data intensive than method 2 above, but at the same time it allows you to specify seasonal and time of day load shape information, which thus allows you to more accurately simulate different seasonal availability characteristics and dispatch strategies for power plants. When using this method you need to specify a Base Year and End Year Load Shape for each module.
> Dear Charlie,
>
> Can we use monthly, or quarterly periode in LEAP?
>
> Regards,
>
> Catur
>
Gustavo Souza 9/18/2009
2386 Views Hi Charlie,
I'm interested in this topic and I've already looked at LEAP trying to find where could I change the availability of the supply side to a more detailed one, as a daily load curve. The only option that I find is the capacity factor. How can I use it in a more detailed way?
Thanks,
Gustavo Souza.
Catur Kurniadi 9/25/2009
2376 Views Dear Charlie,
Do you have any suggestion, how to make supply side analyisis in LEAP if for the final energy demand i make an analysis monthly using econometric methodology?
Regards,
Catur